Black disazo dyestuffs and process of making same.



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FRANZ SCHOLL, OF H6CHST-ON-THE-MAIN,

GERMANY, ASSIGNOR TO FARBWERKE VORM. MEISTER LUCIUS & BRI J 'NING, 0F HfiCI-IST-ON-THE-MAIN, GERMANY, A COR- PORATION O-F GERMANY.

BLACK DISAZO DYESTUFFS AND PROCESS OF MAKING SAME.

No Drawing.

Patented June 18, 1912.

To all whom it" may concern.

Be it known thatI, FRANZ SCHoLL, Ph. D, chemist, a citizen of the Empire of Germany, residing at Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in Black Disa-zo Dyestuffs and Processes of Making Same, of which the following is a specification.

I have found that valuable black basic disazo dyestufl's are obtained by diazotizing "trimethylammoniumphenyl-azo m toluidin and causing it to act upon heteronuclear oea-aminooxynaphthalenes. These new dyestult's are black powders, readily soluble in water with a reddish-violet color, soluble in insoluble v in ether, benzene and ligroin, and are particularly valuable for the dyeing of artificial silk.

The following example illustrates my invention: 3% kg. of hydrochlorid of trimethylau1nionium-pl1enyl-azo-m-toluidin are dissolved in about 1500 liters of water and diazotized with it kg. of hydrochloric acid (19 36.) and 6.9' kg. of sodium nitrite.

This diazo solution is run into a cooled solution of 16 kg. of 1.8-aniino-naphthol in 12 kg. ct hydrochloric acid (19 Be.) and about 600 liters of water. After having stirred this mixture for a good time it is heated to about 50 C. and salted out by adding asolution of common salt. When dry the dyestu'tt' forms a black powder readily soluble in water-with a reddish-violet color which turns red on addition of a mineral acid and greenish-blue on addition of ammonia, soluble in concentrated sulfuric acid with a greenish-blue, and in alcohol with a blue color, insoluble in ether, benzene and ligroin, wh1ch dyes art lficla-l silk a beautiful greenish-black tint. Instead of the lamino-8oxynaphthalene there may be used the l-amino-5-oxynaphthalene.

Having now described my invention, what I claim is:

1. As new products, thebasic disazo dyestutl's of the constitution:

wherein 'R stands for a heteronuelear aminooxynaphthalone, readily soluble in water with a reddish-violet color, soluble in alcohol, insoluble in ether, benzene and ligroin, dyeing artificial silk black tints.

2. As a new product, the basic disazo dyestufi of the constitution:

( ala om being a. black powder, readily soluble in water with a reddish-violet color which turns red on addition of a mineral acid and greenish-blue on addition of ammonia, soluble in concentrated sulfuric acid with a greenishblue, and in alcohol with a blue color, insoluble in ether, benzene and ligroin, artificial silk a greenish-black tint.

3. The process of manufacturing basic disazo dyestufis which consists in diazotizing 'trimethylaminoniumphenyl-azo 1n toluidin and causing it to act upon heteroniiclear a-aamino-oxy-naphthalenes.

In testimony whereof, I aflix my signature in presence of two witnesses.

FRANZ SCHOLL.

"Witnesses JEAN GRITND, CARL G-RUND.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

being" black powders,

dyeing 

